Lathe



2 Sheets-Sheet 1.

(No Model.

B. O. PAY.

LATHE.

No.. 379,568. Patented Mar. 20, 1888.

Ill Sllll Wikq 5 5 E 5 f /f z:- c. 1 @w fy m5.

N, Firms Phnln-ulhognphar. wmmmm n c.

2 Sheets-Sheet 2.

(No Model.)

R. G. FAY.

LATHE.

No. 379,568. Patented Mar. 20, 1888.

I IiIIII Wflqess E5.

Zw/WMgZ NITED STATES PATENT Fries.

RIM MON C. FAY, OF HOPEDALE, MASSACHUSETTS.

LATH E.

SPECIFICATION forming part of Letters Patent No. 379,568, dated March20, 1888.

(No model.)

To aZZ whom it may concern.-

Be it known that I, RIMMON O. FAY, of Hopedale, county of \Vorcester,and State of Massachusetts, have invented an Improvement in Lathes, ofwhich the following description, in connection with the accompanyingdrawings, is a specification, like letters on the drawings representinglike parts.

This invention relates to lathes, and is shown embodied in adrilling-lathe, wherein the work supporting table is continuouslyreciprocated by a cam-feed until automatically stopped, as will bedescribed.

The reciprocation of the work-supporting table is effected, as hereinshown, by a stud secured to the said table and engaging a camgroove in acylinder on a shaft, which is rotated, as shown, by a differentialgearing, to be hereinafter described.

Another feature of my invention consists of a work-holding turretprovided with a yielding or spring clamping device, which presses uponand holds the work in the said turret.

Other features of myinvention will be pointed out in the claims at theend of this specification.

Figure 1 is a longitudinal section of a lathe embodying my invention;Fig. 2, a top or plan View of the lathe shown in Fig. 1, the handwheelbeing omitted; Fig. 3, an end view of the lathe, looking to the left inFig. 1; Figs. 4 and 5, sectional details to be referred to, the sectionbeing taken on line x m, Fig. 1; Fig. 6, a section of Fig. 1 on line x00,- Fig. 7, a section of Fig. 6 on line y y; Fig. 8, a top view of thehand-wheel detached; Figs. 9 and 10, details to be referred to, Fig. 10being a section of Fig. 9 on line 3 y.

The lathe-bed A, the spindle a, and cone a are as usual in lathes ofordinary construction. The spindle a near its rear end has mounted uponit a driving feed cone-pulley, a which in practice is connected to anddrives a cone-pulley, a, on a shaft, a having bearings, as shown, in abushing, a, and in a hub,

a, of a gear, a the said hub being loose in a bushing, a. The shaft tohas a crank-pin, 1),

The teeth of the gears b I) mesh with teeth at the interior of the gearsa b, respectively, the gear a also having external ratchet-teeth, bi(See Fig. 4..) The gear I) has a huh, I), loose in a bushing, I),supported by the frame of the lathe, the said hub having pinned orotherwise fastened to it, as at 3, (see Fig. 1,) one end of a shaft, If.The shaft I) has mounted upon it, as herein shown, two cylinders, b b",shaped to leave a cam'groove, as b, between them when fitted upon thesaid shaft. The camgroove b receives within it, as shown, a trundle, c,mounted on a stud,'c, secured to the under side of the work-supportingtable 0, herein shown as dovetailed onto the lathebed A, (see Fig. 3,)the said cam-groove acting on the said trundle to produce a forward andbackwardmovement of the said work-supporting table when the shaft 1) andcam-cylinder are revolved, as will be described.

The reciprocation of the work-supporting table may be regular orirregular. have a slow forward and a quick return or backward movement,or vice versa; or the forward and backward movements may be alike, orany other desired movement may be obtained by changing the form of thecam-groove Z). The table 0 has secured to it, as shown, a post, 0 uponwhich is placed the hub c of a revolving work-holding turret, 0", havingsuitable holes, 0", herein shown in its periphery to constitutereceivers adapted to receive the pieces, 0 or" work to be operated uponby a tool, (not shown,) but which in practice is carried by the spindlea, in usual manner, the said work holding turret being prevented fromrising up away from the table 0, as herein shown, by a collar, 0fastened on the post 0* by the set-screw c. The receivers of the turretwill be adapted in shape to the things to be held by them. The piece, oof work is held firmly in position while the tool is acting upon it, asshown, by a holder shown as a trundleroller, d, secured to the end of abent springarm, d, fastened, as shown, by screw (1 to a flange, d", of acollar, (1, secured to the post 0 by a setscrew, d The spring-arm dpresses upon the work 0 and holds it firmly in place, and its springqualities accommodate it to work of irregular or varying size. Theturret c has secured to it, as shown, by screws It may d", a toothed orratchet wheel, d, (see Fig. 6,) the teeth of which are engaged, asshown, by a stud, d", on a pawl, d pivoted at al to the bar or platecl", adapted to slide in a guide in the table a, the said pawl beingkept in en gagement with the ratchet-wheel d, as shown, by a spring, 6,secured to the slide-plate d. The ratchet-wheel d preferably has as manyteeth as there are receivers c in the turret a, and the said ratchet isturned one tooth at a time to revolve the said turret, so as to bringthe receivers 0 containing the work to be operated upon, one by one insuccession into position to be acted upon by the tool carried by thespindle a, by a cam, 6, herein shown on the periphery of the handwheel 6(See Figs. 1 and 8.) The cam e, as shown, acts upon a trundle, 0, (seeFig. 1,) secured to a stud, 6*, extended up through aslot, e in theslide bar or plate d, and secured thereto by the nut e, the said cam ateach revolution of the shaft b moving the said plate d forward, therebyrevolving the turret, as above described.

The slide-plate d (see Fig. 1) is restored to its normal position, asherein shown, by a spring, (2 on a rod, a, secured to the stud e,fastened to the said slide-plate, the said spring being located in agroove or pocket in the work-supporting table, one end of the saidspring bearing against the stud e and the other against the end of thesaid groove or pocket.

The turret a may be revolved a greater or less distance, as desired, bychanging the position of the stud e in the slot 0* in the slideplate (1As the slide-bar is moved back to its normal position, a locking-pin, e,on the said slide-bar (see Fig. 1, and dotted line, Fig. 2) entersanotch, e", in the turret, thereby looking the work-holding turret untilthe next forward movement of the slide-plate, the stud d not engagingwith the ratchet-wheel on the next forward movement of the slide-plateuntil the locking-pin has been removed from the notch 6", thuspermitting the turret to be revolved by the said ratchet-wheel and pawl.

The shaft b and with it the cam-cylinder, is

revolved, as herein shown, to produce the reciprocation of the worktablec by a differential movement produced by the two sets of gears a b and bb, substantially as described in United States Patent No. 158,035, datedDecember 22, 1874, to which reference may be had.

The gear a is herein shown as provided with teeth on its periphery,which teeth are adapted to be engaged by a pawl, f, on a short shaft, f,parallel to and behind the shaft b the said shaft f having near itsother end an arm, f (see dotted lines, Fig. 3,) which in practice ismade to extend over a lug or projection, as

f, fast on a sliding hub, f loose on the shaft b and constituting partof an automatic feedstopping device.

The pawl f may be engaged and disengaged from the teeth of the gear a bythe handle f fast on the shaft f. (See Figs. 2 and 3.) y

The pawlf constitutes a stopping device for through the cam -cylinder.

the movement of the feed-cam, and when the pawl is disengaged from theratchet-teeth of the gear a the said gear and the gears 12 and b arerevolved through the crankshaft a, as fully described in the patentreferred to, the gear I) and shaft 1) at such time remaining stationary.When the pawl is in engagement with the ratchet-teeth of the gear a thesaid gear is held stationary, and the gears b, b, and b are drivenpositively, thereby rotating the shaft b and reciprocating thework-supporting table The rotation of the shaft b and thereby the feedof the camcylinder, may-be stopped by disengaging the pawl f from theratchet-teeth of the gear a through the handlef or by moving the hubfrom its fullinto its dotted line position, Fig. 1, so that thecam-lugfwillact upon the arm)".

I prefer to employ the differential movement herein shown; but insteadthereof I may use any other usual or well known equivalent mechanism forproducing the feed.

Figs. 9 and 10 show a modified form of workholder, consisting of acasting or fixture, g, secured by bolts 9', inserted in a T-guide, g",in the slide bar or plate (2, as herein shown, the said slide-bar, whenthe casting is used, being fastened by a screw, 9, (see Fig. 2,) to thetable 0.

The casting or fixture g is slitted for a portion of its length, asshown, as at g, and is provided with a hole in which is fitted abushing, the said bushing being clamped in place in the casting, asshown, by a tap-bolt, g

Thebushing may have any desired form of opening in cross-section toadapt itself to any particular thing to be held therein.

For some particular classes of work the casting with the bushing maytake the place of the work-holding turret, they being fastened to thereciprocating table at any desired point, according to the work to bedone.

It is obvious that the tool-holding spindle and its supports might bereciprocated with relation to the turret by devices such as shown anddescribed as employed to reciprocate the turret; so I do not desire tolimit my invention to reciprocating the turret only; nor do I desire tolimit my invention to the exact shape of the turret or the meansco-operating therewith to retain the work or material to be acted uponfirmly in position while subjected to the action of the tool.

I claim- 1. In a drilling-lathe, a work-holder and a device to lock thesaid work-holder, combined the gear a having ratchet-teeth at itsperiphwith a rotating tool-holding spindle. ery, combined with means,substantially as 3. In a drilling-lathe, the reciprocating described, tohold or release the gear a, to 1 table 0, a cam to operate itautomatically, the insure the operation or stopping of the shaft 5 shaftb and differential gearing to actuate it, If, substantially asdescribed.

combined with a rotating tool-holding spindle. In testimony whereof Ihave signed my name 4. In a lathe, the conibinatioxnwith a workto thisspecification in the presence of two subholding turret, of a holder,substantially as scribing witnesses.

described,co-operating therewith to retain the RIMMON C. FAY. 10 work inposition, substantially as described. Witnesses:

5. In a drilling-lathe, the shafts cf and b E. D. BANOROFT,

and the differential gearing [6, b 1), and b 0. E. LONGFELLO'W.

